Asbel Kiprop of Kenya, gold medal, poses on the podium after the men's 1500m event during the 15th IAAF World Championships at the National Stadium in Beijing

Asbel Kiprop of Kenya, gold medal, poses on the podium after the men's 1500m event during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 30, 2015. REUTERS/Kim Kyung-Hoon

The logo of the International Association of Athletics Federations (IAAF) is seen in Monaco

The logo of the International Association of Athletics Federations (IAAF) is seen in Monaco, March 11, 2016. REUTERS/Eric Gaillard Picture Supplied by Action Images

Sebastian Coe, IAAF's President, attends a press conference as part of the International Association of Athletics Federations (IAAF) council meeting in Monaco

Sebastian Coe, IAAF's President, attends a press conference as part of the International Association of Athletics Federations (IAAF) council meeting in Monaco, November 26, 2017. REUTERS/Jean-Pierre Amet

Journalists are seen near a logo of the IAAF at a hotel where the IAAF council holds a meeting in Vienna

Journalists are seen near a logo of the International Association of Athletics Federations (IAAF) at a hotel where the IAAF council holds a meeting in Vienna, Austria, June 17, 2016. REUTERS/Leonhard Foeger Picture Supplied by Action Images

Runners approach the finish line on Boylston Street during the 122nd Boston Marathon in Boston

Runners approach the finish line on Boylston Street during the 122nd Boston Marathon in Boston, Massachusetts, U.S., April 16, 2018. REUTERS/Brian Snyder

Athletics - IAAF World Half Marathon Championships - Valencia, Spain - March 24, 2018 IAAF President Sebastian Coe presents Ethiopia's Netsanet Gudeta Kebede with a cheque after she won the women's race and setting a new world record REUTERS/Heino Kalis